This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50TC, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI50 Standard Cylinder SI50X50TC
The AirTAC SI50 Standard Cylinder SI50X50TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X50TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X50TC
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI50 Standard Cylinder SI50X50TC
The AirTAC SI50X50TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 50mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X50TC, matching the exact ISO 15552 mounting interface, TC trunnion mount, M16x1.5 rod thread and 30mm cushions.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; for load holding use the SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X50TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50TC |
| Bore size | Ø50 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X50TC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X50TC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X50TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI50 Standard Cylinder SI50X50TC Is Used
Package Diverting
Actuates a TC-mounted diverting arm on a packaging line, using the 982N thrust to push cartons smoothly onto adjacent lanes.
Pallet Stopper Gate
Raises and lowers a 50mm stroke stopper gate at conveyor ends, relying on the ISO 15552 interface for rigid fixture integration.
Clamp Actuation
Drives a short-stroke clamping mechanism in an assembly fixture, where the 825N pull force securely holds workpieces.
Replacing the Airtac SI50 Standard Cylinder SI50X50TC with the SAI50X50TC
To replace the SI50X50TC, order the SAI50X50TC to retain the exact ISO 15552 TC trunnion interface, 50mm stroke, G1/4 port and force. Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor; if position sensing is needed, specify the SAI50X50TCS. Size both ways: step down to a 40mm bore for 628N push at 0.5MPa, or up to a 63mm bore for 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so for holding loads use a pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50TC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X50TC FAQ
Yes, the SI50X50TC is discontinued. The direct replacement is the SAI50X50TC, which shares the same ISO 15552 TC mounting interface, 50mm bore, 50mm stroke, G1/4 port and output force.
This double-acting cylinder has a G1/4 port and generates 982N push / 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X50TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50TC replacement — usually within 7-8 hours.